Retrieving day- and nightside atmospheric properties of the ultra-hot Jupiter TOI-2109b - Detection of Fe and CO emission lines and evidence for inefficient heat transport

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Volume 698 (May 2025)

A&A, 698 (2025) A31

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Table 1

Parameters of the TOI-2109 (BD+16 3058) system.

Parameter	Value
Planet
Radius (R_p)	1.347 ± 0.047 R_Jup
Orbital period (P_orb)	0.67247414 ± 0.00000028 d
Transit epoch (T₀)	2459 378.459370 ± 0.000059 BJD_TDB
Orbital inclination (i)	70.74 ± 0.37 deg
Surface gravity (log g)	3.836 ± 0.071 cgs
RV semi-amplitude (K_p)	259.87 ± 4.45 kms^{−1 (a)}
Systemic velocity (υ_sys)	$- {18.64}_{- 4.98}^{+ 5.86} km s^{- 1 (b)}$ $- 18.64_{ - 4.98}^{ + 5.86}\;{\rm{km}}\;{{\rm{s}}^{ - 1(b)}}$

Star
Radius (R_*)	${1.698}_{- 0.057}^{+ 0.062} R_{⊙}$ $1.698_{ - 0.057}^{ + 0.062}{R_ \odot }$
Mass (M_*)	1.453 ± 0.074 M_⊙
Effective temperature (T_eff)	6540 ± 160K

Notes. ^(a)The RV semi-amplitude was calculated using the expression K_p = (2πGM_*/P_orb)^1/3 · sin i, where G is the gravitational constant, and all other parameters are listed in the table. ^(b)Value derived in this work, see Sect. 5.2.1; all other values from Wong et al. (2021).

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